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Electrical conductivity of Cu-Ag in situ filamentary composites

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中国有色金属学会会刊：英文版 2007年第2期17卷 378-383页

作者：宁远涛张晓辉吴跃军 Kunming institute of precious metals

The electrical conductivity of Cu-10Ag in situ filamentary composite was studied during the deformation and annealing processes. The dependence of electrical resistivity of the deformed composites on the true strain presents a two-stage change with increase of the true strain. The intermediate heat treatment and the stabilized annealing treatment to the deformed composite promote the separation of Ag precipitate, and increase the electrical conductivity. The maximum conductivity of the composite experienced the stabilizing heat treatment can reach about 97% IACS with σb≥400 MPa at 550 ℃ annealing, and reach about 70% IACS with σb≥1 250 MPa at 300 ℃ annealing. The corresponded strength of the composite was reported. The microstructure reason for the changes of the conductivity was discussed.

关键词： Cu-Ag合金丝状复合材料导电性显微结构

Partial phase diagram of Au-Ag-Dy ternary system

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中国有色金属学会会刊：英文版 2005年第4期15卷 738-742页

作者：张康侯陈江 Kunming institute of precious metals

On the basis of Au-Ag, Au-Dy and Ag-Dy binary phase diagrams, the 700℃ isothermal section of Au-Ag-Dy ternary system（Dy≤35%, mole fraction） was established by X-ray diffraction analysis, differential thermal analysis and optical microscopy. It is found that there is a long single-phase region, Au（Ag） or Ag（Au）, along the Au-Ag binary isomorphous system on the gold-silver-rich side of the 700℃ isothermal section and between the binary compound Au2Dy and Ag2Dy there is the all proportional solid solution, （Au2Dy） or （Ag2Dy）. It is confirmed that the partial 700℃ isothermal section consists of six single-phase regions: solid solution Au（Ag） or Ag（Au）, （Au2Dy） or （Ag2Dy）, Au6Dy, Au51Dy14, Au3Dy and Ag51Dy14; nine binary-phase regions: （Au2Dy）+Au（Ag）, Au6Dy+Au（Ag）, Au（Ag）+Ag51Dy14, Ag51Dy14+（Au2Dy）, Au3Dy+（Au2Dy）, Au3Dy+Au51Dy14, Au51Dy14+Au6Dy, Au51Dy14+Au（Ag） and Au（Ag）+Au3Dy;four ternary regions: Ag51Dy14+（Au2Dy）+Au（Ag）, （Au2Dy）+Au（Ag）+Au3Dy, Au（Ag）+Au3Dy+Au51Dy14 and Au51Dy14+Au（Ag）+Au6Dy. No new ternary compound is formed in the gold-silver-rich field（Dy≤35%） of the Au-Ag-Dy ternary system.

关键词：金银镝三重系统等温线相平衡热力学合金相图

Crystallization behavior of Ti_(61.67) Zr_(17.15)Ni_(14.80)Cu_(6.38) glass-forming alloy

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中国有色金属学会会刊：英文版 2004年第1期14卷 156-160页

作者：范金铎高逸群黎仕增 Beijing General Research institute for Non ferrous metals institute of precious metals Guangxi institute of Mechanical & Electrical technology

Ti 61.67 Zr 17.15 Ni 14.80 Cu 6.38 (atom fraction, %) metallic glass has applications in brazing. Using the hammer and anvil technique, Ti 61.67 Zr 17.15 Ni 14.80 Cu 6.38 metallic glass was prepared. The crystallization behavior for this metallic glass was investigated by differential scanning calorimetry(DSC), X ray diffractometry(XRD) and transmission electron microscopy(TEM). There are three stages in DSC curves of crystallization. The reduced glass temperature T rg is 0.42. The kinetic parameters of crystallization were calculated by a set of equations of the maximum crystallization rate. The crystalline phase formed in the MSI(Metastable stage I) is Zr 2Cu, in the MSII is α Ti and in the MSIII is Ti 2Ni. This kind of alloy has lower glass forming ability, and the Ti 61.67 Zr 17.15 Ni 14.80 Cu 6.38 metallic glass has lower thermal stability.

关键词：钛合金非晶合金晶化动力学 TEM DSC XRD

METASTABLE　PHASE　AND　AGE　HARDENING　IN　RAPIDLY－SOLIDIFIED　SILVER－RICH　Ag－Gd　ALLOYS

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中国有色金属学会会刊：英文版 1996年第4期6卷 138-143页

作者： Ning Yuantao(institute of precious metals,Kunming 650221) institute of precious metals Kunming 650221 China

ＭＥＴＡＳＴＡＢＬＥＰＨＡＳＥＡＮＤＡＧＥＨＡＲＤＥＮＩＮＧＩＮＲＡＰＩＤＬＹ－ＳＯＬＩＤＩＦＩＥＤＳＩＬＶＥＲ－ＲＩＣＨＡｇ－ＧｄＡＬＬＯＹＳ￥ＮｉｎｇＹｕａｎｔａｏ（ＩｎｓｔｉｔｕｔｅｏｆＰｒｅｃｉｏｕｓＭｅｔａ... 详细信息

ＭＥＴＡＳＴＡＢＬＥＰＨＡＳＥＡＮＤＡＧＥＨＡＲＤＥＮＩＮＧＩＮＲＡＰＩＤＬＹ－ＳＯＬＩＤＩＦＩＥＤＳＩＬＶＥＲ－ＲＩＣＨＡｇ－ＧｄＡＬＬＯＹＳ￥ＮｉｎｇＹｕａｎｔａｏ（ＩｎｓｔｉｔｕｔｅｏｆＰｒｅｃｉｏｕｓＭｅｔａｌｓ，Ｋｕｎｍｉｎｇ６５０２２１）...

关键词： metastable phase age hardening rapidly-solidified Ag-Gd alloy

RECOVERY OF COLD DEFORMED HIGH PURE SILVER

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中国有色金属学会会刊：英文版 1996年第2期6卷 105-110页

作者： Ning Yuantao Wen Fei Zhao Huaizhi Deng Deguo (institute of precious metals, Kunming 650221) institute of precious metals Kunming 650221 China

ＲＥＣＯＶＥＲＹＯＦＣＯＬＤＤＥＦＯＲＭＥＤＨＩＧＨＰＵＲＥＳＩＬＶＥＲＮｉｎｇＹｕａｎｔａｏ；ＷｅｎＦｅｉ；ＺｈａｏＨｕａｉｚｈｉ；ＤｅｎｇＤｅｇｕｏ（ＩｎｓｔｉｔｕｔｅｏｆＰｒｅｃｉｏｕｓＭｅｔａｌｓ，Ｋｕｎｍｉ... 详细信息

ＲＥＣＯＶＥＲＹＯＦＣＯＬＤＤＥＦＯＲＭＥＤＨＩＧＨＰＵＲＥＳＩＬＶＥＲＮｉｎｇＹｕａｎｔａｏ；ＷｅｎＦｅｉ；ＺｈａｏＨｕａｉｚｈｉ；ＤｅｎｇＤｅｇｕｏ（ＩｎｓｔｉｔｕｔｅｏｆＰｒｅｃｉｏｕｓＭｅｔａｌｓ，Ｋｕｎｍｉｎｇ６５０２２１）Ａｂｓｔｒａｃｔ...

关键词： silver recovery recrystallization

Photochemical Studies on Aqueous Carboplatin

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Science China Chemistry 1994年第7期37卷 799-806页

作者：刘伟平杨懿昆阙振寰熊惠周 institute of precious metals

The photochemical products,quantum yields and mechanisms of aqueous Carboplatin have been studied at 313 and 254 nm *** in the ligand field bands ~1A_1→~1A_2 and ~1A_1→~1E leads to substitution reactions,giving diaquodiammineplatinum and *** then these complexes undergo thermally hydrolysis and polymerization producing polymeric hydroxo-bridged *** is not involved in the *** in the charge-transfer band ~1A_1→~1A_(2u) results in redox reaction. Metallic platinum and diaquodiammineplatinum are formed,respectively,in the absence and the presence of oxygen.

关键词： Carboplatin complex photochemistry anticancer

Photochemical synthesis of bimetallic Au-Ag nanoparticles with “core-shell” type structure by seed mediated catalytic growth

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中国有色金属学会会刊：英文版 2005年第2期15卷 310-313页

作者：董守安唐春 institute of precious metals Kunming 650221 China

The colloidal Au core/Ag shell structure composite nanoparticles were synthesized in PEG-acetone solution by photochemical route. The monodispersed Au nanoparticles with average diameter of 3.9 nm were used as growth seeds. The optical property of colloids and the sizes of composite nanoparticles were characterized when the molar ratio of Au to Ag ranges from 4∶1 to 1∶4. The results show that a composite nanoparticle structure similar to strawberry shape is formed at the molar ratio of Au to Ag from 4∶1 to 1∶1; the composite nanoparticles consisting of a core of Au and shell of Ag were generated at the 1∶4 molar ratio, having a striking feature of forming (interconnected) network structure.

关键词：金-银胶质光化学合成核-壳结构纳米合金材料

Influence of Gadolinium with Small Content on Recrystallization Behaviour in Silver-Gold Alloys

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Journal of Rare Earths 1999年第4期17卷 280-284页

作者：徐云张康侯陈藜莉 institute of precious metals Kunming 650221 China

The influence of small addition of RE element Gd on recrystallization behaviour in isomorphous Ag-Au alloys was studied by differential scanning calorimetry, optical microscopy, transmission electron microscopy and hardness measurement. It is shown that in alloys with 0.2% Gd, disperse second-phase particles are formed, which results in obvious increase in the recrystallization temperature and grain refining. The recrystallization temperature of AgAuGd0.2 alloys also increases with cold working. Small addition of Gd raises the apparent activation energy of recrystallization for Ag-Au alloys.

关键词： rare earths gadolinium silver-gold alloys recrystallization

Influence of Cerium Addition on Microstructure and Properties of Cu-Ag Alloy in Situ Filamentary Composites

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Journal of Rare Earths 2005年第S1期23卷 392-398页

作者：宁远涛张晓辉秦国义 Kunming institute of precious metals Kunming 650221 China

The in situ filamentary composites based on the Cu-10Ag and Cu-10Ag-Ce alloys were prepared. The microstructure and properties of the composites were studied. The effects of Ce addition on the microstructure as cast, including refining Cu grains and the Ag filaments, increasing the proportion of (Cu+Ag) eutectic and decreasing the proportion of the Ag precipitate, were researched. The average size of the Ag filaments in the composites could be approached by a formula: d=C·exp(-0.228η), here C is a coefficient related to the size of the original grains and 1500 nm for Cu-10Ag and 800 nm for Cu-10Ag-Ce. A two-stage strain strengthening effect was found for the deformed composites, that is the dislocation strengthening at low strain stage and the ultra-fine Ag filaments or interface strengthening at the high strain stage. The intermediate heat treatment at lower temperature further refined the Ag filaments and therefore improved the properties. The high strengthening rate of Ce addition on Cu-10Ag alloy attributed the refining effect to Cu grains and Ag filaments. The typical properties of the heavy deformed composites with 1 IHT reached to UTS=1500 MPa with conductivity 62% IACS for the Cu-10Ag alloy and UTS=1550 MPa with conductivity 65% IACS for the Cu-10Ag-Ce alloy, respectively.

关键词： composite Cu-Ag alloy Ce addition microstructure strength conductivity